单项选择题

某二叉树有5个度为2的结点以及3个度为1的结点，则该二叉树中共有结点数为______。

A．11
B．12
C．13
D．14

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单项选择题

在下列程序的空白处，应填入的正确选项是______。 Import java. io. * ; Pulilc class ObjectStreamTest Publilc static void main(string args[]) throws IOException ObjectOutputStream oos=new ObjectOutputStream (new FileOutputStream( serial. bin )); Java. util. Date d=new Java. util. Date(); Oos______(d); ObjectlnputStream ois= new ObjectInputStream(new FileOutputStream( serial. bin )); try java. util. date restoredDate= (Java. util. Date)ois. readObject(); System. out. println ( read object back from serial. bin file: +restoredDate); Catch(ClassNotFoundException cnf) System. out. println( class not found );

A．WriterObject
B．Writer
C．BufferedWriter
D．writerObject

单项选择题

下列程序的功能是统计字符串中“array”的个数，在程序的空白处应填入的正确选项是______。 public class FindKeyWords public static void main(sring[]args) sting text= An array is a data structur that stores a collection of + values of the same type. You access each individual value + through an integer index. For example, if a is an array + of inergers, then a[i] is the ith integer in the array. ; Int arrayCount=0; Int idex=-1; Sting arrarStr= array ; Index=text. indexof(arrayStr); While(index______0) ++arrayCount; Index+=arrayStr. length(); Index=text. indexof(arrayStr，index); System. out. println ( the text contains +arrayCount+ arrays );

A．＜
B．=
C．＜=
D．＞=

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